condition mean min max ZT0-3 2.7083925 1.80936 3.607425 ZT4-7 0.0 0.0 0.0 ZT8-11 1.786895 1.786895 1.786895 ZT12-15 0 0 0 ZT16-19 5.3285800000000005 5.3285800000000005 5.3285800000000005 ZT20-23 5.38145 5.38145 5.38145